Remote-control unit for wireless receiving apparatus



7 Jan. 1, 1929. 1,697,778

F. w. RENWICK REMOTE CONTROL UNIT FOR WIRELESS RECEIVING APPARATUS Filed July 19, 1924 3 Sheets-Sheet 1 glnucnfoz, 2a ig milifiwmur .5" :5

Jan. 1, 1929. 1,697,778

F. w. RENWICK REMOTE CONTROL UNIT FOR WIRELESS RECEIVING APPARATUS Filed July 19. 1924 3 Sheets-Sheet 2 FIQZ.

Jan. 1, 1929.

F. W. RENWICK REMOTE CONTROL UNIT FOR WIRELESS RECEIVING APPARATUS Filed July 19, 1924 3 Sheets-Sheet 3 F IG. 1 2

FIG. 1 8

gwuewto'a .FUIIJZenwzb/z- Patented Jan. I, 1929.

'UNITED STATES PATENT OFFICE.

FREDERICK W. RENWICK, OF CAMDEN, NEW JERSEY, ASSIGNOR OF ONE-HALF TO JOHN S. LAT'IA, OF PHILADELPHIA, PENNSYLVANIA.-

REMOTE-CONTROL UNIT FOR WIRELESS RECEIVING APPARATUS.

Application filed July 19, 1924. Serial No. 726,966.

The present invention is a remote control unit for wireless receiving apparatus.

The primary object of this invention is to combine into a single structural unit various 5 instrumentalitics, employed for varying the inductance and wave length value of circuits and for collecting electric energy to bring circuits into tune or resonance, in such a manner that the said unit may be moved independently of the remainder of the apparatus.

A further object of the Y invention is to connect a unit of the above mentioned type with the remainder of a receiving, set in such a distant point -t'rom the set for constituting a. remote control.

A still further object of the invention is to con'ibine in a unit of the above set forth type a circuit making andbreaking mechanism and a signal element which may be employed for placing the entire apparatus into and out of operation and for indicating" such changes.

Other objects and advantages of the invention will be apparent during the course ot. the following description.

This invention covers the structure employed for providing the remote control illustrated diagrammatically in the application for wireless reriving apparatus filed by 30 Frederick W. Renwick on July 3, 1924,.Serial No. 724,085. I

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughoutthe same,

Figure 1 illustrates a perspective view of the assembled remote control unit embodying this invention,

Figure 2 illustrates a central vertical sectional view of one remote control unit embodying this invention,

Figure 3 illustrates a top plan view of one ren'iote control unit with the controlling knob and casino; removed,

Figui'e 4 is a fragmentary vertical sectional view of a portion of the inst-rumentalities disclosed in Figs. 2 and 3, I

Figure 5 is a fragmentary vertical sectional view of the'base portion and casing illustrated in Figs] to 3 inclusive and illustrates in ele' ration a circuit make and breaking means.

F ig'ure'ti is transverse sectional view of t.he,structure illustrated in Fig. 5,

Figure 7 is alvertical, sectional view of the structure illustrated in Figs. 5 and 6,

Figure 8 is a transverse sectional view of the structure illustrated in Figs. 5 to 7 inclumm,

Figure 9 is a detail perspective View of the movable elements in the circuit making and breaking means disclosed in Figs. 5 to 8 inclusive, I

F igure 10 is a detail perspective view of a connector element illustrated in Figs. 2 to 4 inclusive,

Figure .11 is a diagrammatical View illustrating: the wiring connection for the remote control unit set forth in Figs. 1 to 11 inclu a manner that the said unit may be placed at Y sive,

F igure 12 illustrates a vertical sectional view of a modified form of remote control unit en'lbodying this invention, and

Figure 13 is a diagrammatical view of the wiring system -t'or the remote control unit illustrated in Fig. 12, and further discloses in top plan one of the instrumentalities embodied in this unit.

in the drawings, wherein for the purpose of illustration is shown a preferred embodiment of this invention, the numeral 5 desig nates a base whlch is formed of any sultable insulating material having a rabbeted edge 6,

' as best. illustrated in Figs. 2 and 7. Suitably secured to the upper face of this insulator base 5 and arranged in close proximity to the peripheral edge of the same are a plurality of angular brackets 7 which are provided with the threaded apertures 8 for the reception of screws 9 employed for securing the inverted cup-shaped casing 10 in place, as illustrated in Figs. 1 and 2. V

Suitably secured to the insulator base 5 are a plurality of posts 11 which are equally spaced from each other and are employed for supporting a variable condenser structu e of the coarse and Vernier adjustable type.

This variable condenser includes the spaced plates 12, 13 and 14 which are of substantially semi-eircular shape and are secured to the posts by the pairs of nuts 15, 16 and 17 respectively, as best illustrated in Fig. 2. Carried by the posts 11 and positioned between the adjacent nuts of the pairs of nuts 15 and 16 are the fixed plates 18 which are retained in spacedrelation to each other by the spacer -19. Located between the adjacent nuts of the pairs of nuts 16 and 17 are a plurality of fixed condenser plates 20 which are maintained in'spaced relation to each other by the spacing elements 21.

plates Loosely mounted upon the shaft 22 is a tube 26 which has a portion of the same j ournaled in the insulator plate 14. Rigidly mounted upon this tube 26 are a plurality of plates 27 which are maintained in spaced relation to each other by the spacing elements 28 and are clamped in place by the nut 29 which is threa'dedly connected to the lower end of the tube 26. These plates 27 are adapted to be rotated with the tube 26 and are so arranged in respect to the plurality of fixed plates that the rotation of the tube 26 will produce the coarse adjustment of the condenser.

Suitably connected to the upper end portion of the tube 26, as by the set screw 30, is a metallic disk 31 which has secured thereto a larger. disk 32'formod of insulating material. In Figs. 2 and 3this disk 32 is illustrated as having secured to its upper face in proximity to its periphery an annular ring 33 which is graduated as at 34. Inserted through the disk 32 and ring 33 and suitably secured thereto is a pin 35 which is adapted to be removably received within the notch 36 formed in the arm 37 which is provided with a tubular hub 38 loosely mounted upon the shaft 22 in proximity toits outer end. Removably connected to this tubular hub 38 is an operating knobor wheel 39 which is maintained in fixed relation to the said tubular hub 38 by the set screw 40.

It will. now be seen that rotation of the knob or wheel 39 will cause the arm 37 to travel around the shaft 32. This movement of the arm, due to the notch 36 and pin 35,

will cause the ring 33 and disk 32 to rotate and the 1 connection between the disk 32 and the disk 31 will cause the tube 26 having the plates 27 mounted thereon to rotate mg the relative positions of the for vary- 1 plates 27 with respect to the plates 20.

In Fig. 4, the metallic disk 41 is illustrated as being connected to the shaft 22 by the set screw 42 which will cause the said disk 41 to rotate with the said shaft. Connected to this disk is a larger disk 43 which has the numbered scale lines 44 formed on its upper face in proximity to its periphery. A knob or handle 45 is illustrated as being connected to the outer threaded end of the shaft 22 and being retained thereon by the set screw 46. It will now be seen that the shaft 22 with its fixed plate 25 and scaled disk 44 may be rotated independently of the plates 27 and their to the lamp socket 52. extends from this lamp socket 52 to the recooperating elements by means of the knob or handle 45.

, InFigs. 1 and 2 the top wall 10 of the inverted cup-shaped casing 10 is illustrated as having a window or opening 47 formed 7 therein through which the scale lines 34 and 44 on the ring 33 a iidfldisk 43 may be viewed. Removably connected toithis wall 10*, as by the screw 48' is a block 49 formed of insulating material having a needle or pointer '50 ex- 7 tending laterally therefrom andbrossing the scale lines 34 and 44. This needle o pointer 50 is employed for indicating the adjustments mzade to the Vernier plate 25 and coarse plates Rigidly secured to the insulator base 5 is an angle bracket 51 which has mounted on I its upper arm 51 a lamp socket 52 within which the lamp bulb 53 is mounted. The socket 52 is provided with a laterally extending switch contact 54 which is adapted to be engaged by the movable switch arm 55' carried by the flexible metallic strip 56 which is comnected to the casing 10 in proximity to its edge by means of the pair of screws 57 which are threadedly received within the apertures 58 formed in this strip 56. The upper offset end 56 of this strip 56 is adapted to be engaged by the inner end of the stem 59 which is carried by the knob 60 and is journaled within the tubular boss 61 formed in the wall of\the casing 10. The inner edge of this boss 61 is provided with a cam surface 62 against which the pin 63, carried by the stem 59, rides for causing the rotation of the knob 60 and stem 59 to move the strip 56 with its switch blade 55 from its full line position, as" illustrated in Fig. 7 to its dotted line position for causing the switch blade 55 to electrically engage the pin 54 carried by-the lamp socket 52.

In Fig. 11 the wiring system for the various instrumentalities illustrated as being housed structure are connected in series and provided with a wire w which is intended to be connected to the remainder of the receivi set in a suitable manner. The second side 0 this condenser structure C is=provided with a wire '--bwhich also extends to the remainder of wire a is a wire -.d which is connected A second wire -e-- mainder of the receiving apparatus. The

-movab1e blade 55 is electrically connected to the receiving apparatus by the wire As has been stated above, this. invention covers the .structure employed for providing the receiving apparatus. Connected to the the remote control illustrated diagrammati? cally in the application for wireless receiving apparatus Serial 724,0 8'5. It be understood that the wires a, -b, -e and may be embodied in a cable 64 which extends .outwardly through a bushing 65 carried by the casing 1O for connection with the proper instruments embodied in the different hook-ups illustrated. in this copending application. This cable 64, including the wires -a,, b-, eand -f may be made of any desired length for permitting the operator ofa wireless receiving set to control the latter from a distant point such as an adjoining room to the one within which the remainder of the set is positioned.

It is believed that the operation of the coarse and vernier condenser portion will be understood from the above detail description, therefore no further explanation of this portion of the unit is deemed necessary. The switch structure is intended to be employed for connecting the filament battery to the filament or filaments in the detecting and amplifying tubes employed in the apparatus to which this unit is connected. It will, therefore, be seen that when the knob 60 is rotated for causing the pin 63 to engage the lowest side of the cam surface 62 the battery circuit to the bulb filaments will be broken for placing the entire apparatus out of commission. The knob 60 may also be rotated for causing longitudinal movement of the stem 59 to place the movable switch blade 55 in engagement with the socket 52 for closing the filament circuit to place the apparatus in operation.

In Figs. 12 and 13 there is disclosed a modified form of remotecontrol unit which consists of a. wariable condenser of the coarse adjustable type and a variometer with its secondary coil adjusted by means of the shaft illustrated in Figs. 1 to 4 inclusive as constituting means for adjusting the the vcrnier condenser plate. It is believed unnecessary to go to any great length in describing the portions of this modified form of remote control unit that are identical with the similar portions illustrated in Figs. 1

' to 10 inclusive. It is believed that by employing the same reference numerals that a thorough understanding of the structure more particularly illustrated in Fig. 12 will be understood.

The new structure disclosed in Figs. 12 and 13 includes the stationary secondary coil 66 which is retained in place by the angle bracket 67 secured to one sidewall of the casing 10. It will be seen, by inspecting Fig. 12 that this stationary primary coil is ec centrically arranged in respect to the casing 10. Housed within this primary coil 66 is a secondary coil 68 which includes a hub 69 having the radial spokes 70. It will be seen by inspecting Fig. 13 that this secondary coil 68 is eccentrically mounted in i respect to the axes of the primary coil 66 and the casing 10. The tube 26 which encircles the portion of the shaft 22 within the second ary coil 68 is provided with a slot 71 through which extends a set screw 72 which passes through the hub 69 of the secondary coil 68 and is fastened at its inner end within a recess formed in the shaft 22. It will now be understood that rotation of this shaft 22 will cause the secondary coil 68 to be moved relatively to the stationary primary coil 66, as illustrated in dotted lines in Fig. 13. j i

Fig. 13 shows the wiring diagram for this modified form of remote control unit. It will be seen that the coils 66 and 68 constitute a variometer and that the condenser C is connected in series with the coils 66 and 68 by the wire 73, the movable secondary coil 68 being connected in series with the primary coil '66 by the wire 74. One side of the condenser structure C is connected to a wire a which is intended to be connected at its opposite end to the wireless rece ving apparatus as has been described in connection with wire a in Fig. 11. Wire b extends from the secondary coil 68 to the receiving apparatus in the same manner as described-in connection with wire b in Fig.

11. The lamp socket 52 is connected to the Wire a by the wire d, as described in connection with Fig. 11. The further connections consist of the wire e which leads from the lamp socket '52 to the receiving apparatus and the wire f which leads from the movable switch blade to the filament battery circuit of the receiving apparatus.

It is now believed that the method of constructing the two different forms of remote control unit and the manner of operating the same will be clearly understood from. the above detail description. and for this reason no further explanation is deemed necessary.

It is understood that the forms of this invention herewith shown and described are to be taken as preferred examples of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the suboined claims.

Having thus described the invention, I claim '1. In a control unit for wireless receiving apparatus, an insulating base, an inverted cup-shaped casing removably secured to said base, an adjustable Wireless receiving circuit .control instrumentality housed within said casing, means projecting outwardly of said casing and operatively connected to said inoutwardly of said casing and adapted for connection with a receiving set.

2. In a control unit for wireless receiving -apparatus, an insulating base, a variable jecting outwardly of said casing and operatively connected to said switch mechanism for ad usting the latter, and a cable including a plurality of wires connected to the condenser structure, the switch mechanism, and

the signal elen'ient and projecting outwardly of 'Sflld casing and adapted for connection with a receiving set.

3. In a control unit for wireless receiving apparatus, a casing, a plurality of groups of stationary condenser plates mounted in said casing, a shaft journaled insaid casing and projecting therefrom, a plurality of condenser plates supported by said shaft and movable relative thereto and one group of immovable plates, a single condenser plate connected to saidshaft for movement therewith and relatively to, the second group of immovable plates, means loosely carried by the projecting portion of said shaft and connected to the plurality of movable plates for adjusting the latter, means rigidly mounted on the projecting portion of said shaft for operating the latter to move the single con denser plate, a signal element within said casing, a switch mechanismassociated with said signal element, 3116.3} cable including a plurality of wires connected to said condenser plates, and said signal element with its switch mechanism and projecting outwardly of said casing for connection with areceiving set. q

4. In a control unit for wireless receiving apparatus, a casing, a wireless receiving circuit control instrumentality housed within said casing, means visible from without the casing for indicating the adjustments made to said instrumentality, illuminating means within said casing for making visible the I last mentioned means, and a cable including a plurality of wires connected .to' said 1nstrumentality and said illuminating means and projecting outwardly of said casing for connection with. a receiving set. i

5. In a control unit for wireless receiving apparatus, a casing, a plurality of groups of stationary condenser plates mounted in said casing, a shaft journaled in said casing and projecting therefrom, a tube loosely mounted on said shaft, aglurality of condenser plates rigidly mounte upon said tube and interposed between one group of stationary plates, a single condenser plate operatively connected to said shaft and interposed between the second group of stationary plates, a dial rigidly connected to said tube, a second dial rigidly connected to said shaft, means loosely end of said shaft for varying the position of the single movable condenser plate, said dials indicating the adjustments made to said condenser plates.

6. In a control unit for wireless receiving apparatus, a control shaft, a sleeve loosely. surrounding a portion of the length of the control shaft, a dial fastened to one end of the sleeve, a smaller dial fastened to the shaft to overlie'the first mentioned dial, a knob fastened to the shaft for rotating the same and its dial, a second knob loosely mounted on the shaft, and means for connecting the second knob to the first mentioned dial at apoint outwardly of the periphery of the smaller dial so that said knob may rotate the first mentioned dial and the sleeve.

7. In a control unit for wireless receiving apparatus, a control shaft, a sleeve loosely surrounding a portion of the length of the control shaft, a one end portion thereof, a ring having graduations displayed thereon fastened to the disk, asmaller disk having graduations displayed at its periphery fastened to the shaft an loosely fitted-within the ring, a knob fastened to theshaft for rotating the same and its dial, asecond knob loosely mounted upon the shaft, an arm carried by the second knob, and means for operatively connectingthe arm to, the'rin knob may rotate the and the sleeve.

8. In a control device for wireless receiv' ing apparatus having an adjustable wireless receiving circuit control instrumentality, a casing, means strumentality including a manually operable element carried by and projecting outwardly of said casing, means includin an-indicator carried by the casing for in mating the adjustments made to said instrumentality, and. a switch carried by the casing for rendering the receiving circuit'operative or inoperative, at will. p,

9. In a control device for Wireless receiving apparatus, a casing, an adjustable wireless receiving circuit control instrumentality, means for adjustin said instrumentality including. a manually operable element carried by and projecting outwardly of said casing, means including an indicator carso that the second rst mentioned disk for adj usting said incarried by and projecting outwardly of said casing, means including an indicator within the casing for indicating the adjustments made to said instrumentality, said casing having an opening through which said indicating means maybe viewed, and a cable projecting outwardly of said casing and including wires operatively connected to said 20 instrumentality.

In testimony whereof I aifix my signature.

FREDERICK W. RENWIGK. 

